yeah, that remark sounded funny.So, here's a somewhat odd moment. Towards the end when the Mirror Enterprise is emerging from the subspace aperture, we see on the Disco bridge all anyone can see is a silhouette of a Constitution class ship, at which point Stamets asks "is that the ISS Enterprise?" That's quite the leap to make based on the evidence that was available to him at that moment.
Regarding the breen, I’m glad they fleshed them out a bit and that they have some interesting unique traits. Could have been any other race? Sure, but then people would bicker about discovery introducing a new race. What we got is consistent with the little we saw of the breen in the past and adds to the lore.